Iron-based catalysts are the most suitable candidates for converting CO2 or CO2-rich syngas to hydrocarbons. However, several issues about the mechanism of CO2 hydrogenation are still unclear. In this work, we investigated the performance of an iron-based catalyst with H2/CO2, H2/CO/N2 and H2/CO/13CO2/N2 gas mixtures at the same process conditions (T = 270°C, P = 175 psi and SV = 3 NL/h/gcat). The CO2 hydrogenation rate was much lower than that observed for CO hydrogenation. 13CO2 tracer experiments indicated that CO2 is hydrogenated to hydrocarbons via the reverse water-gas shift even when present in small concentration (1.8 vol%). 13C enrichment was observed in both CO and C1-C4 hydrocarbons.
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This work was supported by the Commonwealth of Kentucky.
Badoga, Sandeep; Martinelli, Michela; Gnanamani, Muthu Kumaran; Koh, Young; and Shafer, Wilson D., "New Mechanism Insight for the Hydrogenation of CO/CO2 Gas Mixtures to Hydrocarbons over Iron-Based Catalyst" (2021). Center for Applied Energy Research Faculty and Staff Publications. 38.